Show me my money.

I have complaining since 2016 about my rates bill i have logged numerous tickets by the C.C.C and everytime my tickets gets closed without a reason. Finally a inspector came out and found that the device water meter number and the meter number on my statement is two different numbers which means i was billed incorrectly and requested that the relevant department needs to update there system (SAP) and adjust my account as it is a "business meter" and i live in a residential area. I waited a couple of months and nothing happened, i phoned in again and the call centre advised me that issue has been resolved so i asked her what about my credit of the money i payed for 1 and a half year for which i was billed incorrectly and she advise she will send a request to the account department to handled and the next day she phoned me saying that the account department closed the request as the matter is sorted, so i asked her what about my refund or credit but she advised me she will get back to me. The same day i phoned her back and i got through to different agent i explained her everything and when i ask yet again "what about the credit to my account "and she just keep on avoiding the question. I am very upset and don`t know what to do anymore as i have tried and done everything they (C.C.C) told me to do. You can contact me on ********** if unclear or what to ask more questions. PLEASE HELP ME!!!!!